Wax Deposition
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Influence of Refinery Asphalt Residue Addition on Flow: A Study Using Waxy Model-System
One of the main phenomena causing problems in the oil industry is the precipitation of waxes, which can crystallize and form deposits, clogging lines and reducing flows. Many studies have been conducted seeking to overcome this problem, mainly through application of chemical to increase flow. Some studies have shown that the asphaltenes present in crude oil
Journal of the Brazilian Chemical Society. Publicado em: 2023
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2. EFFECT OF OIL TEMPERATURE ON THE WAX DEPOSITION OF CRUDE OIL WITH COMPOSITION ANALYSIS
Abstract Wax deposition behavior was investigated in a set of one-inch experiment flow loops, using a local crude oil with high wax content. The temperature of the oil phase is chosen as a variable parameter while the temperature of the coolant media is maintained constant. Detailed composition of the deposit is characterized using High Temperature Gas Chrom
Braz. J. Chem. Eng.. Publicado em: 2016-12
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3. A New, Simple and Efficient Method of Steglich Esterification of Juglone with Long-Chain Fatty Acids: Synthesis of a New Class of Non-Polymeric Wax Deposition Inhibitors for Crude Oil
A esterificação direta de naftoquinonas mostrou-se uma tarefa difícil. Metodologias mais comuns envolvem a aplicação de cloretos de acila em piridina ou anidridos, entretanto, quando ácidos de cadeia longa são utilizados tais metodologias se mostram ineficientes devido aos baixos rendimentos obtidos. Aprese
J. Braz. Chem. Soc.. Publicado em: 2015-01
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4. Cuticle of 'Gala' and 'Galaxy' apples cultivars under different environmental conditions
This study aimed to analyze the cuticle thickness and pattern of epicuticular wax deposition in 'Gala' and 'Galaxy' apple cultivars (Malus domestica Borkh,) from three Brazilian producing areas: Vacaria (RS), Fraiburgo (SC) and São Joaquim (SC) with altitudes of 971, 1,048 and 1,353m, respectively. Harvested fruit were kept under two storage conditions: reg
Braz. arch. biol. technol.. Publicado em: 2012-10
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5. WAX DEPOSITION STUDY IN A MULTIPHASE PIPE FLOW / ESTUDO DA DEPOSIÇÃO DA PARAFINA EM ESCOAMENTO MULTIFÁSICO EM DUTOS
O Petróleo é formado por um conjunto de hidrocarbonetos. No reservatório, devido à altas pressões e temperaturas, encontra-se na forma de líquido. Conforme o petróleo escoa, a pressão cai assim como a temperatura, devido a perda de calor para o ambiente marinho, causando a liberação do gás dissolvido no petróleo tornando o escoamento bifásico. A
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/04/2011
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6. EXPERIMENTAL STUDY WAX DEPOSITION IN TURBULENT FLOW / ESTUDO EXPERIMENTAL DA DEPOSIÇÃO DE PARFINA EM ESCOAMENTO TURBULENTO
Um dos principais problemas encontrados na produção de petróleo em águas profundas é a deposição de parafina em linhas de produção e transporte. À medida que o óleo escoa pelos dutos, perde calor para o ambiente marinho mais frio, reduzindo a solubilidade dos hidrocarbonetos mais pesados, podendo levar à deposição destes componentes nas paredes
Publicado em: 2010
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7. Anatomical and physico-chemical characteristics of fruits of apple trees (Malus domestica Borkh.) and their relations to lenticel breakdown / Características anatômicas e físico-químicas de frutos de macieira (Malus domestica Borkh.) e sua relação com a lenticelose
The aim of this study was to describe anatomical and physico-chemical characteristics of apple fruits (Malus domestica Borkh.) Gala and Galaxy grown in three different altitudes, seeking to correlate them to the physiological disorder known as lenticelose (lenticel breakdown), characterized by the darkening of lenticels and the occurrence of brownish depress
Publicado em: 2010
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8. Effect of laser e LED radiations associated or not on dorsal cutaneous wound repair in a rodent model: histologic study. / Efeito das radiações laser e LED associadas ou não no reparo de feridas cutâneas em dorso de ratos: estudo histológico.
The aim of the present investigation was to evaluate histologically tissue repair on dorsal cutaneous wounds in a rodent model treated with Laser and/or LED, using diode Laser GaAlAs λ660nm and λ790nm and LEDs of three wavelengths. Forty-four young adult male Wistar rats were used, weighting between 200 and 250 grams. After, one excisional wound wa
Publicado em: 2008
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9. NUMERICAL SIMULATION OF WAX DEPOSITION IN PETROLEUM LINES: ASSESSEMENT OF MOLECULAR DIFFUSION AND BROWNIAN DIFFUSION MECHANISMS / SIMULAÇÃO NUMÉRICA DA DEPOSIÇÃO DE PARAFINA EM DUTOS DE PETRÓLEO: AVALIAÇÃO DOS MECANISMOS DE DIFUSÃO MOLECULAR E DIFUSÃO BROWNIANA
Wax deposition is one of the major critical operational problems in crude oil pipelines operating in cold environments. Therefore, accurate prediction of the wax deposition is crucial for the efficient design of subsea lines. Unfortunately, wax deposition is a complex process for which the mechanisms are still not fully understood. Aiming at the identificati
Publicado em: 2007
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10. Estudo bioquimico e da estrutura foliar de plantulas do jatoba da mata (Hymenaea courbaril L.) e do cerrado (Hymenaea stigonocarpa Mart.) expostas a concentração elevada de C O IND. 2 / Structural and biochemical study of leaves of jatobas Hymenaea coutbaril L. and H. stigonocarpa Mart. exposed to elevated concentrations of carbon dioxide atmosphere
The atmospheric concentration of carbon dioxide (CO2) increased from 280 ppm, during the Industrial Revolution period, to about 370 ppm in the nowadays. It is continuing to increase about 1.8 ppm per year. The effect of this rise in CO2, which is leading to global warming have attracted considerable attention, generating reports on how these changes can affe
Publicado em: 2007
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11. DEPOSIÇÃO DE PARAFINA EM ESCOAMENTO LAMINAR NA PRESENÇA DE CRISTAIS EM SUSPENSÃO / WAX DEPOSITION IN LAMINAR FLOW WITH SUSPENDED CRYSTALS
Offshore crude oil production is steadily growing. Oil transport in these cold environments (deep water) causes the precipitation of the heavy organic crude oil components like waxes. Wax deposition at the inner wall of pipelines is a serious problem in crude oil transportation causing the partial or total plugging of pipelines, increase in pumping energy an
Publicado em: 2006
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12. AVALIAÇÃO DO MECANISMO DE DIFUSÃO MOLECULAR PARA A MODELAGEM DA DEPOSIÇÃO DE PARAFINA EM DUTOS DE PETRÓLEO / ASSESSMENT OF MOLECULAR DIFFUSION AS A MECHANISM FOR WAX DEPOSITION IN PETROLEUM PIPELINES
Deposição de parafinas, com alto peso molecular, na parede interna de linhas submarinas de produção e transporte continua a ser um problema crítico encontrado pela indústria de petróleo. Uma previsão precisa das taxas de deposição e da distribuição espacial da parafina depositada é uma informação fundamental para o projeto de linhas submarinas
Publicado em: 2005